[3] Hirundo is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.

Known for their graceful flight and regular migrations, swallows feature a short bill with a wide gape, small weak feet, and typically a deeply forked tail.

[4][6][13] In September 2000, a rotational lightcurve of Hirundo was obtained from photometric observations by American Brian Warner at the Palmer Divide Observatory (716) in Colorado.

Lightcurve analysis gave a rotation period of 22.027±0.005 hours with a high brightness variation of 0.9±0.03 magnitude, indicative of an elongated shape (U=3).

[14] Further observations by René Roy (2011), Patrice Le Guen (2018), and Anaël Wünsche and Raoul Behrend (2020) determined a period of (22.002±0.003 h), (22.0±0.5 h) and (22.00248 h) with an amplitude of (0.39±0.01), (0.68±0.05) and (0.15±0.04) magnitude, respectively (U=3/2/n.a.).